Is where a merchant chooses to route a multi-network debit card transaction to the lowest cost network for that transaction, which in many cases will be the eftpos network. Least-cost routing is sometimes also referred to as ‘tap and save’, ‘merchant choice routing’, ‘wave and save’, ‘lowest-cost routing’, ‘low-cost routing’, ‘merchant routing’, or ‘smart routing’. However, these terms are not always interchangeable because how this functionality is applied by service providers can vary. It is important to understand the differences – read the Least-Cost Routing Guide for further information.